Quote Originally Posted by Silvanshei View Post
Does the spell slot remain consumed until the stone is used or can someone charge multiple stones over many days? It would be fun to capture spellcasters and siphon their power to create "grenades" for a whole army.
My initial thought was that the spell slot recovers normally. So, given enough time and materials a spellcaster could create a significant stockpile of charged stones.

On the other hand, this stuff's rare. A single deposit might only have 5-10 stones in it total. One thing I didn't post was the ability to embed a stone into a weapon, creating a magical weapon that you can channel the stored spell through (and counts as magical until the stone is exhausted). I'd expect more of those to be used. The direct use (grenades) was designed as a field-expedient use for characters who stumble across some in an abandoned mine, etc.